Using PHP configured for Apache with IIS
Solution 1:
For all your IIS7 + PHP needs start here:
PHP on IIS7 : The Official Microsoft IIS Site
The simplest way to install PHP on IIS7 is just to browse to that site on your server and click the big blue "Install PHP" button. This will launch the Web Platform Installer which will guide your through the install process.
To do this manually see this article:
Using FastCGI to Host PHP Applications on IIS 7
There's also an alternative article on IIS.NET:
Install and Configure PHP
You will want one of the following binary packages for the "Install and Configure PHP" step:
PHP 5.3.6 - VC9 x86 Non Thread Safe - zip
or
PHP 5.2.17 - VC6 x86 Non Thread Safe - zip